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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: IndexedFieldParser.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Predicate;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterables;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.NoSuchElementException;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.regex.Matcher;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.core.ComplexField;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.core.Field;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.core.FieldSwitchAdapter;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.core.ObjType;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.core.SimpleField;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>/**<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Parses the name of an indexed field.<a name="line.23"></a>
<span class="sourceLineNo">024</span> *<a name="line.24"></a>
<span class="sourceLineNo">025</span> * &lt;p&gt;<a name="line.25"></a>
<span class="sourceLineNo">026</span> * Syntax examples:<a name="line.26"></a>
<span class="sourceLineNo">027</span> * &lt;ul&gt;<a name="line.27"></a>
<span class="sourceLineNo">028</span> *  &lt;li&gt;&lt;code&gt;Person.lastName&lt;/code&gt;&lt;/li&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span> *  &lt;li&gt;&lt;code&gt;Person.friends.element&lt;/code&gt;&lt;/li&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> *  &lt;li&gt;&lt;code&gt;Person.grades.key&lt;/code&gt;&lt;/li&gt;<a name="line.30"></a>
<span class="sourceLineNo">031</span> * &lt;/ul&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span>public class IndexedFieldParser implements Parser&lt;IndexedFieldParser.Result&gt; {<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    private final SpaceParser spaceParser = new SpaceParser();<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    @Override<a name="line.37"></a>
<span class="sourceLineNo">038</span>    public Result parse(final ParseSession session, final ParseContext ctx, final boolean complete) {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>        // Get object type<a name="line.40"></a>
<span class="sourceLineNo">041</span>        final int typeStart = ctx.getIndex();<a name="line.41"></a>
<span class="sourceLineNo">042</span>        final ObjType objType = new ObjTypeParser().parse(session, ctx, complete);<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>        // Get indexed field<a name="line.44"></a>
<span class="sourceLineNo">045</span>        ctx.skipWhitespace();<a name="line.45"></a>
<span class="sourceLineNo">046</span>        if (!ctx.tryLiteral("."))<a name="line.46"></a>
<span class="sourceLineNo">047</span>            throw new ParseException(ctx, "expected field name").addCompletion(".");<a name="line.47"></a>
<span class="sourceLineNo">048</span>        ctx.skipWhitespace();<a name="line.48"></a>
<span class="sourceLineNo">049</span>        final Matcher fieldMatcher = ctx.tryPattern("\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*");<a name="line.49"></a>
<span class="sourceLineNo">050</span>        if (fieldMatcher == null) {<a name="line.50"></a>
<span class="sourceLineNo">051</span>            throw new ParseException(ctx, "expected field name").addCompletions(Iterables.transform(Iterables.filter(<a name="line.51"></a>
<span class="sourceLineNo">052</span>               objType.getFields().values(), new HasIndexedPredicate()), new FieldNameFunction()));<a name="line.52"></a>
<span class="sourceLineNo">053</span>        }<a name="line.53"></a>
<span class="sourceLineNo">054</span>        final String fieldName = fieldMatcher.group();<a name="line.54"></a>
<span class="sourceLineNo">055</span>        final Field&lt;?&gt; field;<a name="line.55"></a>
<span class="sourceLineNo">056</span>        try {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            field = Iterables.find(this.filterFields(objType.getFields().values()), new ParseUtil.HasNamePredicate(fieldName));<a name="line.57"></a>
<span class="sourceLineNo">058</span>        } catch (NoSuchElementException e) {<a name="line.58"></a>
<span class="sourceLineNo">059</span>            throw new ParseException(ctx, "error accessing field `" + fieldName + "': there is no such indexed field in " + objType)<a name="line.59"></a>
<span class="sourceLineNo">060</span>              .addCompletions(ParseUtil.complete(Iterables.transform(Iterables.filter(<a name="line.60"></a>
<span class="sourceLineNo">061</span>                this.filterFields(objType.getFields().values()), new HasIndexedPredicate()), new FieldNameFunction()), fieldName));<a name="line.61"></a>
<span class="sourceLineNo">062</span>        }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>        // Get sub-field if field is a complex field<a name="line.64"></a>
<span class="sourceLineNo">065</span>        return field.visit(new FieldSwitchAdapter&lt;Result&gt;() {<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>            @Override<a name="line.67"></a>
<span class="sourceLineNo">068</span>            protected &lt;T&gt; Result caseComplexField(ComplexField&lt;T&gt; field) {<a name="line.68"></a>
<span class="sourceLineNo">069</span>                ctx.skipWhitespace();<a name="line.69"></a>
<span class="sourceLineNo">070</span>                if (!ctx.tryLiteral(".")) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>                    throw new ParseException(ctx, "expected sub-field name").addCompletion(".");<a name="line.71"></a>
<span class="sourceLineNo">072</span>                }<a name="line.72"></a>
<span class="sourceLineNo">073</span>                final Matcher subfieldMatcher = ctx.tryPattern("\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*");<a name="line.73"></a>
<span class="sourceLineNo">074</span>                if (subfieldMatcher == null) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>                    throw new ParseException(ctx, "expected sub-field name").addCompletions(Iterables.transform(Iterables.filter(<a name="line.75"></a>
<span class="sourceLineNo">076</span>                       field.getSubFields(), new IsIndexedPredicate()), new FieldNameFunction()));<a name="line.76"></a>
<span class="sourceLineNo">077</span>                }<a name="line.77"></a>
<span class="sourceLineNo">078</span>                final String subName = subfieldMatcher.group();<a name="line.78"></a>
<span class="sourceLineNo">079</span>                final SimpleField&lt;?&gt; subField;<a name="line.79"></a>
<span class="sourceLineNo">080</span>                try {<a name="line.80"></a>
<span class="sourceLineNo">081</span>                    subField = Iterables.find(IndexedFieldParser.this.filterSubFields(field.getSubFields()),<a name="line.81"></a>
<span class="sourceLineNo">082</span>                      new ParseUtil.HasNamePredicate(subName));<a name="line.82"></a>
<span class="sourceLineNo">083</span>                } catch (NoSuchElementException e) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>                    throw new ParseException(ctx, "unknown sub-field `" + subName + "' of complex field `" + fieldName + "'")<a name="line.84"></a>
<span class="sourceLineNo">085</span>                      .addCompletions(ParseUtil.complete(Iterables.transform(Iterables.filter(<a name="line.85"></a>
<span class="sourceLineNo">086</span>                         IndexedFieldParser.this.filterSubFields(field.getSubFields()), new IsIndexedPredicate()),<a name="line.86"></a>
<span class="sourceLineNo">087</span>                        new FieldNameFunction()), fieldName));<a name="line.87"></a>
<span class="sourceLineNo">088</span>                }<a name="line.88"></a>
<span class="sourceLineNo">089</span>                return new Result(fieldName + "." + subName, this.verifyIndexedSimple(subField), field);<a name="line.89"></a>
<span class="sourceLineNo">090</span>            }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>            @Override<a name="line.92"></a>
<span class="sourceLineNo">093</span>            protected &lt;T&gt; Result caseField(Field&lt;T&gt; field) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>                return new Result(fieldName, this.verifyIndexedSimple(field));<a name="line.94"></a>
<span class="sourceLineNo">095</span>            }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>            private SimpleField&lt;?&gt; verifyIndexedSimple(Field&lt;?&gt; field) {<a name="line.97"></a>
<span class="sourceLineNo">098</span>                if (!(field instanceof SimpleField) || !((SimpleField&lt;?&gt;)field).isIndexed())<a name="line.98"></a>
<span class="sourceLineNo">099</span>                    throw new ParseException(ctx, "expected indexed field");<a name="line.99"></a>
<span class="sourceLineNo">100</span>                return (SimpleField&lt;?&gt;)field;<a name="line.100"></a>
<span class="sourceLineNo">101</span>            }<a name="line.101"></a>
<span class="sourceLineNo">102</span>        });<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    protected Iterable&lt;? extends Field&lt;?&gt;&gt; filterFields(Iterable&lt;? extends Field&lt;?&gt;&gt; fields) {<a name="line.105"></a>
<span class="sourceLineNo">106</span>        return fields;<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    protected Iterable&lt;? extends SimpleField&lt;?&gt;&gt; filterSubFields(Iterable&lt;? extends SimpleField&lt;?&gt;&gt; subFields) {<a name="line.109"></a>
<span class="sourceLineNo">110</span>        return subFields;<a name="line.110"></a>
<span class="sourceLineNo">111</span>    }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>// Return type<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>    /**<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * Result returned from an {@link IndexedFieldParser} parse.<a name="line.116"></a>
<span class="sourceLineNo">117</span>     */<a name="line.117"></a>
<span class="sourceLineNo">118</span>    public static class Result {<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>        private final String fieldName;<a name="line.120"></a>
<span class="sourceLineNo">121</span>        private final SimpleField&lt;?&gt; field;<a name="line.121"></a>
<span class="sourceLineNo">122</span>        private final ComplexField&lt;?&gt; parentField;<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>        Result(String fieldName, SimpleField&lt;?&gt; field) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>            this(fieldName, field, null);<a name="line.125"></a>
<span class="sourceLineNo">126</span>        }<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>        Result(String fieldName, SimpleField&lt;?&gt; field, ComplexField&lt;?&gt; parentField) {<a name="line.128"></a>
<span class="sourceLineNo">129</span>            this.fieldName = fieldName;<a name="line.129"></a>
<span class="sourceLineNo">130</span>            this.field = field;<a name="line.130"></a>
<span class="sourceLineNo">131</span>            this.parentField = parentField;<a name="line.131"></a>
<span class="sourceLineNo">132</span>        }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>        /**<a name="line.134"></a>
<span class="sourceLineNo">135</span>         * Get the field's name.<a name="line.135"></a>
<span class="sourceLineNo">136</span>         *<a name="line.136"></a>
<span class="sourceLineNo">137</span>         * @return field name<a name="line.137"></a>
<span class="sourceLineNo">138</span>         */<a name="line.138"></a>
<span class="sourceLineNo">139</span>        public String getFieldName() {<a name="line.139"></a>
<span class="sourceLineNo">140</span>            return this.fieldName;<a name="line.140"></a>
<span class="sourceLineNo">141</span>        }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>        /**<a name="line.143"></a>
<span class="sourceLineNo">144</span>         * Get the indexed field.<a name="line.144"></a>
<span class="sourceLineNo">145</span>         *<a name="line.145"></a>
<span class="sourceLineNo">146</span>         * @return indexed field<a name="line.146"></a>
<span class="sourceLineNo">147</span>         */<a name="line.147"></a>
<span class="sourceLineNo">148</span>        public SimpleField&lt;?&gt; getField() {<a name="line.148"></a>
<span class="sourceLineNo">149</span>            return this.field;<a name="line.149"></a>
<span class="sourceLineNo">150</span>        }<a name="line.150"></a>
<span class="sourceLineNo">151</span><a name="line.151"></a>
<span class="sourceLineNo">152</span>        /**<a name="line.152"></a>
<span class="sourceLineNo">153</span>         * Get the indexed field's parent field, if any.<a name="line.153"></a>
<span class="sourceLineNo">154</span>         *<a name="line.154"></a>
<span class="sourceLineNo">155</span>         * @return indexed field's parent field, or null if the indexed field is not a sub-field<a name="line.155"></a>
<span class="sourceLineNo">156</span>         */<a name="line.156"></a>
<span class="sourceLineNo">157</span>        public ComplexField&lt;?&gt; getParentField() {<a name="line.157"></a>
<span class="sourceLineNo">158</span>            return this.parentField;<a name="line.158"></a>
<span class="sourceLineNo">159</span>        }<a name="line.159"></a>
<span class="sourceLineNo">160</span>    }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>// Functions and Predicates<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    private static class FieldNameFunction implements com.google.common.base.Function&lt;Field&lt;?&gt;, String&gt; {<a name="line.164"></a>
<span class="sourceLineNo">165</span>        @Override<a name="line.165"></a>
<span class="sourceLineNo">166</span>        public String apply(Field&lt;?&gt; field) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>            return field.getName();<a name="line.167"></a>
<span class="sourceLineNo">168</span>        }<a name="line.168"></a>
<span class="sourceLineNo">169</span>    }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>    private static class IsIndexedPredicate implements Predicate&lt;SimpleField&lt;?&gt;&gt; {<a name="line.171"></a>
<span class="sourceLineNo">172</span>        @Override<a name="line.172"></a>
<span class="sourceLineNo">173</span>        public boolean apply(SimpleField&lt;?&gt; field) {<a name="line.173"></a>
<span class="sourceLineNo">174</span>            return field.isIndexed();<a name="line.174"></a>
<span class="sourceLineNo">175</span>        }<a name="line.175"></a>
<span class="sourceLineNo">176</span>    }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span>    private static class HasIndexedPredicate implements Predicate&lt;Field&lt;?&gt;&gt; {<a name="line.178"></a>
<span class="sourceLineNo">179</span>        @Override<a name="line.179"></a>
<span class="sourceLineNo">180</span>        public boolean apply(Field&lt;?&gt; field) {<a name="line.180"></a>
<span class="sourceLineNo">181</span>            return field instanceof SimpleField ? ((SimpleField&lt;?&gt;)field).isIndexed() :<a name="line.181"></a>
<span class="sourceLineNo">182</span>              field instanceof ComplexField ? Iterables.any(((ComplexField&lt;?&gt;)field).getSubFields(), new IsIndexedPredicate()) :<a name="line.182"></a>
<span class="sourceLineNo">183</span>              false;<a name="line.183"></a>
<span class="sourceLineNo">184</span>        }<a name="line.184"></a>
<span class="sourceLineNo">185</span>    }<a name="line.185"></a>
<span class="sourceLineNo">186</span>}<a name="line.186"></a>
<span class="sourceLineNo">187</span><a name="line.187"></a>




























































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